Hioki MR8827, Instruction Manual

Page: 259 / 436

254
FFT Analysis Condition Settings
■ Trigger Modes and Averaging
If the trigger mode is [Single] or the calculation setting is [Once]
Measurement continues until the specified number of averaging points is acquired
When the acquired count < the specified count
*1
When the acquired
count = the specified count
Start Measurement
START key
End
*2
Trigger
criteria met
Input
Signal
Trigger
Wait
Waveform acquisition
(specified no. of points)
Averaging
FFT
analysis
FFT
analysis
(Spectrum averaging) (Time-domain waveform averaging)
Display
*3
*1. Awaiting trigger continues until the specified count is reached.
*2. Measurement stops automatically when the specified count is reached. If measurement was interrupted by
the STOP key, the averaging result up to that point is displayed.
*3. If [Reference] is [New Data] and automatic saving or automatic print is [On] , data is saved or printed
when the specified number of times is reached.
If the trigger mode is [Continue] or the calculation setting is [Repeat]
Measurement continues after the specified averaging count has been acquired.
When the specified averaging count is exceeded, averaging is repeated and measurement
continues until the STOP key is pressed.
Repeats until the STOP key is pressed
End
*1
Start Measurement
START key
Trigger
criteria met
Input
Signal
Awaiting
Trigger
Averaging
Display
*2
FFT
analysis
FFT
analysis
(Spectrum averaging) (Time-domain waveform averaging)
STOP key
Waveform acquisition
(specified no. of points)
*1. When stopped before the specified count, the average up to that point is displayed.
*2. If [Reference] is [New Data] and automatic saving or automatic print is [On] , data is saved or printed
when the specified number of times is reached.
When the trigger mode is [Auto]
• For time-domain waveforms
When the START key is pressed, after a certain interval data will be acquired even if trigger
criteria are not met. This means that if averaging is applied to an asynchronous signal, the
resulting data is meaningless.
• For time-domain waveforms
When the START key is pressed, measurement starts. Even if the trigger criteria are not met, the
specified amount of data is acquired, and after FFT analysis, the results are averaged.
When the specified averaging count is exceeded, averaging is repeated and measurement
continues until the STOP key is pressed.
Repeats until the STOP key is pressed
End
*
Start Measurement
START
key
After a certain interval,
acquisition starts even if
trigger criteria are not met
Input
Signal
Awaiting
Trigger
Averaging
Display
FFT
analysis
FFT
analysis
(Spectrum averaging) (Time-domain waveform averaging)
STOP key
Waveform acquisition
(specified no. of points)
* When stopped before the specified count, the average up to that point is displayed.